P0303 and now all codes P0301 - P0306 Issue pls pls help

Discussion in 'Chrysler 300 Electrical Problems and Questions' started by Omesh V, Feb 4, 2018.

  1. Omesh V

    Omesh V New Member

    Joined:
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    Gender:
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    Location:
    Philippines
    Vehicle:
    Chrysler 300c 2.7Lx
    Vehicle Yr:
    Gen1 - 2008
    Trim?:
    300C
    Color?:
    Midnight Blue
    Hi,

    I had misfire issues with engine so i sent the Car to a Chrysler specialist and after testing coils and ignition wire harness they told me to replace ECM and so we did but still had error and mis fire.

    I have read that the Ecm will cut electricity to the Injector if its senses faulty injectors so can i assume i should replace one and or all of the injectors? As per testing one wire does not send electricity to the coil which at this point cannot be ecm issue.

    I personally feel the engine would run smooth for a few seconds after disconnecting the battery and deleting codes.

    Can someone guide me pls.

    This is what i read ina forum... see Note: as below.

    10. FUEL INJECTOR

    Turn the ignition off.
    Disconnect the Fuel Injector harness connector.
    Ignition on, engine not running.

    NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinders Injector Control circuit.

    With the scan tool, erase DTCs.
    Using a 12-volt test light connected to 12-volts, probe the Injector Control circuit.
    With the scan tool, actuate the Fuel Injector.
    Does the test light blink/flicker?
    Yes >> Replace the Fuel Injector.
    Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
    No >> Go To 11
     
  2. Kyler

    Kyler New Member

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    Gender:
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    Location:
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    Vehicle:
    300s
    Vehicle Yr:
    Gen2 - 2012
    Trim?:
    300S
    Color?:
    White
    Checkout your fuel injectors.
    Run a tons of cleaner through the system if you can still drive it or take them out one by one and visually inspect/clean them.
    I've dealt with P0300 on my previous Challenger and the problem was the dealer left one cam one notch off timing when doing a belt replacement.

    Things I personally checked before I found that out includes...
    Coils
    Plugs
    All the wiring anywhere you can see in the engine bay - looking for frayed or loose connections, melting, anything abnormal
    EGR Valve
    Purge canister
    Fuel pressure
    Cylinder pressure
    Throttle body calibration

    There is so many different things it could be but an engine needs 3 things in sync to operate - air, fuel, spark.
    So look at each system one by one.
    If you started with one cylinder misfire and now it's all 6 there is something happening on a larger scale.
    Hope you didn't pay much for the ECM as what I've read that is usually the last resort.
     
  3. Omesh V

    Omesh V New Member

    Joined:
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    Gender:
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    Location:
    Philippines
    Vehicle:
    Chrysler 300c 2.7Lx
    Vehicle Yr:
    Gen1 - 2008
    Trim?:
    300C
    Color?:
    Midnight Blue
    Hi Kyler,

    Thanks for the suggestions. I had an injector purchased from oreily and will arrived next week. I think it would either be the injector/s or if not it would be cylinders which i hope is not the case.

    I got the ecm for 200usd plus labor 150usd for check up of wire harness... it was both unecessary but this is what happens when we bring our cars to shops.

    Ill update and will share developments soon.
     

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